#include "ros/ros.h"
#include "std_msgs/Int8.h"  
class subInt8 {
public:
    subInt8() {};
    void chatterCallback(const std_msgs::Int8::ConstPtr& msg)
    {
        ROS_INFO("I heard: [%d]", msg->data);
    }
};

int main(int argc, char** argv)
{
    ros::init(argc, argv, "listener");
    ros::NodeHandle n;
    subInt8 s8;
    ros::Subscriber sub = n.subscribe("/test/sub_in_class", 2, &subInt8::chatterCallback, &s8);
    ros::spin();
    return 0;
}
